Vertigo/Republic RecordsRiding high on the success of Black Sabbath's 13, which debuted at #1 on the Billboard 200 this week, frontman Ozzy Osbourne is already thinking about the group’s next release. While the singer says he’s hoping to make more new music with the band, it will depend on guitarist Tony Iommi, who's currently battling lymphoma.

"At the moment, we're doing so many weeks on the road, then [Iommi] has to go back for more treatment," Ozzy tells U.K. newspaper The Telegraph. "He's had chemo and radiotherapy, and now he's on a thing to boost his immune system. I really hope it's gone for good. But you never know with that stuff."

As for the incredible reception 13 is receiving, Osbourne declares, "I knew it was a f***ing good album, but when somebody just told me it's gone top in 50 countries -- I didn't know there were 50 countries, and I'm number one in all of them!"

Among those other countries in which 13 hit #1 is Ozzy's homeland, the United Kingdom. In the process, Black Sabbath set a British record for the most years between chart-topping studio releases from an artist. The band's last studio effort to reach the top of the U.K.'s Official Albums Chart was 1971's Paranoid, which accomplished the feat 42 years and eight months ago.